This exceptional 1970 Chevrolet Chevelle LS6 convertible is rare in every sense of the word and has the build sheet to support it. The documented factory-production 13-second Chevelle LS6 is one of just 18 convertibles known to exist. Few were equipped with a 4-speed manual transmission like this one, and this unique car was ordered with stripe and cowl-induction delete, making it one of the rarest LS6s on the planet. This formidable and distinctive LS6 underwent a ground-up restoration when it was part of the Milt Robson Collection and shows just 50,356 miles on the odometer.

The Chevrolet Chevelle was a big hit with more than 440,000 produced in 1970. The ultimate Chevelle package occurred that same year as Chevrolet offered 450-horsepower worth of LS6 Turbo-Jet power to those willing to pay $263.30 for the factory 454-cubic-inch big-block engine. Fitting the car with an LS6 required options that backed up all that power with heavy-duty engineering and added nearly $1,000 to the base price. With that expense in mind, 4,475 Chevelle buyers chose the legendary LS6 engine. Only a tiny fraction of these were LS6-equipped Chevelle convertibles.

The build sheet for this rare LS6 convertible was discovered in the process of a comprehensive restoration. The documentation helps decode why this particular LS6 may represent the very zenith of American muscle car performance development, divulging that the original owner of this Medium Turquoise Metallic muscle car specified stripe and cowl-induction delete with a 4-speed manual to help the 454 deliver its wicked punch. It was as close as any Chevelle LS6 convertible could ever get to being a sleeper, and it was awesome, especially for the unsuspecting passenger who got the thrill ride of a lifetime.

With a Holley 4-barrel carburetor, aluminum dual-plane intake manifold and dual exhaust, the LS6 engine was conservatively rated for 450 horsepower and 500 lb-ft of torque. The 454 was prepared by the factory with a forged crankshaft and pistons with 4-bolt mains. A high-performance camshaft with solid lifters worked dual-sprung oversized valves in the cast-iron heads. The 6,500 RPM redline required deep-groove accessory pulleys. The engine is backed by a Muncie M22 Rock Crusher 4-speed manual transmission and heavy-duty 12-bolt rear axle for supercar-level factory performance that thrust the LS6-equipped 1970 Chevelle into the 13-second quarter-mile club right off the showroom floor.

High performance was not the only refinement to the Chevelle formula for 1970. More sculptured styling emphasized the sporty body lines. The horizontally split front grille featured 4-across headlights. The Super Sport package brought distinctive brightwork, a black-painted grille and SS badging. The code-34 Medium Turquoise Metallic paint is as it once was, returned to its original luster during the restoration. The car sports a convertible top in white, which opens to a Parchment vinyl interior with optional Strato Bucket seats, pushbutton AM radio and a 4-speed floor-mount shifter proves to be the only subtle hint of the monster that lies under the hood.

The Super Sport package and LS6 engine together brought handling and traction improvements to the A-body platform SS454. The F41 suspension group packed heavy-duty coil springs, front and rear anti-sway bars, and box welded rear lower control arms. Power front disc brakes and power steering help control the horsepower. The Chevelle rides on 14x7-inch Super Sport wheels with SS center caps and Goodyear Polyglas tires.

The LS6 remains a legend to this day. It was a fire that burned brightest just prior to the flame being snuffed out on the original American high-performance era. This Chevelle LS6 convertible’s incredible combination of factory performance and distinctive options make it rare even amongst muscle car royalty.

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Information found on the website is presented as advance information for the auction lot. Photos, materials for videos, descriptions and other information are provided by the consignor/seller and is deemed reliable, but Mecum Auction does not verify, warrant or guarantee this information. The lot and information presented at auction on the auction block supersedes any previous descriptions or information. Mecum is not responsible for information that may be changed or updated prior to the auction. The decision to purchase should be based solely on the buyers personal inspection of the lot at the auction site prior to the auction.